MIPS: asm: pgtable: Prevent HTW race when updating PTEs

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commit fde3538a8a upstream.

Whenever we modify a page table entry, we need to ensure that the HTW
will not fetch a stable entry. And for that to happen we need to ensure
that HTW is stopped before we modify the said entry otherwise the HTW
may already be in the process of reading that entry and fetching the
old information. As a result of which, we replace the htw_reset() calls
with htw_{stop,start} in more appropriate places. This also removes the
remaining users of htw_reset() and as a result we drop that macro

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9116/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Markos Chandras 2015-01-26 09:40:36 +00:00 • committed by Greg Kroah-Hartman

parent 6ce23db8e9

commit e3201ff0ee

1 changed files with 4 additions and 10 deletions

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arch/mips/include/asm/pgtable.h

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